#include<iostream>
using namespace std;
class CAverage{
	public:
	doubule operator()(int a1,int a2,int a3)
	{
		return(double)(a1+a2+a3)/3;
	 } 
};
int main()
{
	CAverage average;
	cout<<average(3,2,3);
	return 0;
}
